Porter-Cable PXCMSAC420VW - Troubleshooting

16- ENG
TROUBLESHOOTING
Risk of Unsafe Operation. Unit cycles automatically when
power is on. When servicing, you may be exposed to voltage sources, com-
pressed air, or moving parts. Before servicing unit unplug or disconnect elec-
trical supply to the air compressor, bleed tank of pressure, and allow the air
compressor to cool.
PROBLEM CAUSE CORRECTION
Low pressure or
not enough air
or Compressor
does not stop
Tank drain valve is open Close drain valve.
Fittings leak Check fittings with soapy water.
Tighten or reseal leaking fittings.
DO NOT OVERTIGHTEN.
Restricted air intake Clean or replace intake filter element.
Prolonged excessive
use of air
Decrease amount of air used.
Compressor not
large enough
Check air requirement of accessory.
If it is higher than CFM and
pressure supplied by compressor,
you need a larger compressor.
Most accessories are rated at 25% of
actual CFM while running continuously.
Hole in air hose Check and replace if necessary.
Tank leaks
Immediately replace
tank. DO NOT attempt to repair.
Blown seals Replace seals.
Valve leaks Replace seals.
Leaking or worn piston Replace piston.
Air leaks from
regulator, or
regulator does
not regulate
pressure
Dirty or damaged
regulator internal parts
Replace regulator or internal parts.
Regulated
pressure
gauge reading
drops when
air accessory
is being used
This is normal If pressure drops too low, adjust
regulator while accessory is used.
Compressor not
large enough
Check air requirement of accessory.
If it is higher than CFM and pressure
supplied by compressor, you need a
larger compressor. Most accessories
are rated at 25% of actual CFM
while running continuously.
Pressure relief
valve opens
Tank pressure exceeded
normal operating pressure
Replace pressure switch.
Pressure switch stuck Replace pressure switch.